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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 8
 1
 2
 4

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 460 V
 200 V
 115 V
 230 V

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Electrical Machines
In DC generator, full form of MNA is what?

 Magnetic no-load axis.
 Magnetically no-load armature co-ordinate.
 Magnetic neutral armature co-ordinate.
  Magnetic neutral axis.

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Electrical Machines
Resistance commutation is used generally in case of

 DC machines bellow 5 kW.
None of these
 DC machines above 10 kW.
  fractional kW DC machines.

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Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

 2.74 Ω.
 2.781 Ω.
 25.564 Ω.
  2.241 Ω.

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Electrical Machines
DC machine windings are

 either of these
 full pitched
 short pitched
None of these

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MORE MCQ ON Electrical Machines

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